Boiler with superheater



Oct. 27

1925 B. BRolDo BOILER WITH SUPFRHEATBR 2 SheetS-Sheec 1 Filed Feb. e, 1922 lll/ y HG1 B. BROIDO Oct. 27, 1925.

.BOILER WITH SUPERHEATER Filed Feb. 6. 1922 2 Sheets-Sheet' 2 Patented 9ct. .27, i925.

UNITED STATES PATENT OFFICE.

BENJAMIN BROIDO, F NEWYYORK, N. Y., ASSIGNOR TO THE SUPERHEATER COINIPANY, OF NEW YORK, N. -Y., A CORPORATION OF DELAWARE.

BOILER WITH SUPER/HEATER.

Application led February l6, 1922. Serial No. 534,478.

To aZZ whom t may concer/n:

Be it known that I, BENJAMIN BRoIDo, a citizen of the United States, and residentvof the city of New York, N. Y., have invented certain new and useful Improvements in Boilers with Superheaters, of which the following is a specification.

My invention relates to the use of super heaters in connection with water tube boilers l0 of the type often referred to rather loosely as the vertical type. In this type there are two or more, usually three, upper drums, and one or more lower drums, the upper drums being connected to the lower drum or drums by banks of tubes. The object of the invention is to provide an improved superheater arrangement in such boilers, whereby high degrees of superheat may be obtained; the headers and the connections of the superheater elements be protected from excessive heat and at the same time remain accessible for inspection, etc.; the removal and replacement of elements of the superheater be easily effected; all of the superheater elements be self-draining; and withal the operation of the boiler be not interfered with by the presence of the superheater.

The following description to be read in connection with the accompanying drawings, will make clear the nature and operation of my invention. In said drawings Fig. 1 shows in longitudinal section a water tube boiler of thetype spoken of'with a superheater installed according to my invention. Fig. 2 illustrates on a larger scale, Va somewhat modified form of my invention in another well known boiler of this general type; and Fig. 3 shows still another arrangement in a third boiler 'of this general type, the scale of this figure being the same as that of Fig. 1., f

Referring first to Fig. l, the boiler has a front, a middle, and a rear upper drum, numbered respectively 1, 2, and 3, and connected by banks of tubes 4, 5,'and 6 respectively to the lower drum 7, Drums 1 and 2 are connected tol each other'by a set of tubes 8, and drums 2 and 3 by a set of 'tubes 9. A casing 10 yencloses the boiler.

11 is the combustion chamber, bounded at the rear by bridge wall 12; while 13, 14, and 15 are baffles to guide the gases on their passage from the combustion chamber 11 to the stack connection 16. Steamjs taken off at the nozzle 17. All of these parts are of a usual construction.

Various ways have been proposed of installing superheaters in boilers of this type, the places suggested ranging from near the point Where the gases finally -leave the boiler to a location in some `part of the rebox itself. Perhaps the location best adapted from all points of view is between the first two banks of water' tubes. At this point the gases have ample heat to. furnish the high degree of superheat which engineers everywhere are beginning to demand, and yet have in their passage over the first bank of tubes become tem ered suiciently to remove any danger of injury to the superheater from excessive temperatures. This has been recognized by many, and various forms 'of superheaters have been devised for Vuse in this space. None of them, however, meet all the requirements of best practice. In some the headers of the superheaters are quite inaccessible so the joints between the elements and the headers cannot readily be inspected and repaired; in others the arrangement does not permit of ready drainage of moisture from the superheater; others block the passsage of the heating gases so the operation of the boiler is interfered with; and others have still other faults.

In my arrangement the superheater elements 18 are placed in parallel vertical planes in the upper part of the triangular space between the first and second banks of water tubes. The ends 19 and 2O of the elements extend backward between the rows of tubes of bank 5 and are bent downward to the headers 21 and 22, to which they are secured preferably in some readily detachable manner. If desired, the headers may be additionally protected by inserting the baille 25, which reduces the proportion of gases passing into the triangular space between bafes 14 and 15. On the other hand the pasarseprinciple of my invention would be equally employed even if baille 1a were omitted. ln fact, this principle isbroadly that the main portion of the superheater elements lies on the side of the bank of water tubes nearest the source of hot gases and the headers to which the elements are attached lie on the farther and therefore cooler side of the bank where they are protected by the water tubes, and in some cases a baffle, from the more intense heat. Obviously this principle is of use no matter whether it is the tirst, second or third bank of a boiler of this type which separates the two; and it is partic, ularly pointed out that the drawings must be regarded as illustrative only-and not as limiting my invention in this respect.

rllhe elements are supported by the transversely extending bar 23 and by hangers 24C.

The operation of a boiler equipped as described will be obvious. 'lhe manner of removal of elements for re airs or replacements may however be rieHy described.V

lo eect such removal, the connection of the element in question with the headers 19 and '2O is broken, and the element is withdrawn through the opposite space between tubes in bank 8, the necessary part of the roof resting on the top of this bank of tubes having been removed. As an alternative which may in some cases be preferable the element after being detached from the headers maybe moved through the appropriate space between rows of tubes in bank 4 into the combustion chamber 11 and thence out through the firing door.

It will be noted that the advantages above spoken of are obtained in any arrangement.

Referring next to Fig. 2', the superheater elements 18 are seen to extend not only within the space between'the first two banks of tubes, but into the spaces between the tubes of the first bank 4. rlhis will be advisable in some cases where, as in the one shown, the space between the banks is so small that a superheater of adequate size cannot be accommodated within it. The principle above pointed out is preserved here, the headers 21, 22 lying on the side of a bank away from the source of hot gases and the superheater elements on the side toward it.

In Fig. 3 a boiler is shown having tluee upper drums, 1, 2, and 3 and ythreen lower drums, 7, 7", and 7, connected respectively by the three banks of tubes 4, 5, and.

The superheater elements are placed in the space between the banks i and 5, and are shown as of somewhat diiierent form, each being made up of two branches 1(83 and 18", connected to he two Ys 18 and 18d, which inturn are connected to the headers 21 and 22 by the lengths 18e and Il@ extending through bank 5.

rlhe arrangements shown illustrate suiciently that my invention has application to various boilers and that the details ma be considerably varied without departing trom its spirit.

lVhat ll claim is:

1. ln apparatus of the classdescribed, the combination of a boiler having a `iront, a middle, and a rear upper drum and a lower drum and three banks of water tubes connecting 'the three upper drums to the lower drum; superheater elements in the space between the front and the middle banks of tubes; and superheater headers in the space between the middle and rear banks; the elements being connected to the headers by portions extending between rows of tubes in the middle bank.

2. lin apparatus of the class described, the combination of a boiler having a front, a middle, and a rear upper drum and a lower drum and three banks of water tubes connecting the three upper drums to the lower drum; superheater elements in the space between the front and the middle banks of tubes; and superheater headers in the space between the middle and rear banks and in a plane below the superheater elements; the elements being connected to the headers by portions extending between rows of tubes in the middle bank.

3. In apparatus of the class described, the combination of a boiler having a front, a middle, and a rear upper drum, a lower drum, three banks of tubes connecting the three upper drums to the lower drum, and a bankof tubes connecting the front and middle upper drums; superheater elements in the space between the front and the middle banks of tubes; superheater headers in the space between the middle and real` banks; the elements being connected to the headers by portions extending between rows of tubes in the middle bank; and means extending between rows of tubes connecting the front and middle upper drums supporting the superheater elements.

4f. lin apparatus of the class described,r

the combination of a front, a middle, and a rear upper drum, a lower drum, three banks of tubes respectively connecting the three upper drums to the lower drum; a baille extending behind the rst bank of tubes from the lower drum and terminating short of the upper front drum; a badle behind the second bank of tubes superheater elements in the spa-ce between the front and the middle banks of tubes; and superheater headers in the space between the middle and rear banks; the elements being connected to the headers by portions extending between rows of tubes in the middle bank and through the second named bae.

5. lln apparatus `of the class described, the combination of a front upper drum, a

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second upper drum, and a. lower drum, a aplurality of tubular superheater elements front and a second bank ef tubes connectbetween the two banks of tubes, said eleng the upper drums respectively to the ments having portions extending between 10 lower drum, means to cause hot gases to rows of tubes of the' second bank connecting pass rst over the front and then over the the elements to the headers.

second bank, a pair of superheater headers adjacent to the second bank of tubes, and BENJAMIN BROIDO. 

